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Parkinson's disease brain surgery. Surgeons implanting two electrodes for deep brain stimulation (DBS) of areas of the brain in a patient with Parkinson's disease. The electrodes provide continuous electrical stimulation, which blocks the signals that cause the tremors characteristic of Parkinson's disease. This operation is being carried out by a team led by Professor Stephan Chabardes. Photographed at the Centre Hospitalier Universitaire Grenoble, Grenoble, France.